Improvement in sash-holders



UNITED STATES PATENT OFFICE.

JOHN DAVIS, OF COUNCIL HILL STATION, ILLINOIS.

IMPROVEMENT IN SASH-HOLDEPLS.

Specification forming part of Letters Patent No. 40,161, dated October 6, 1863.

To all whom it may concern:

Beit known that I, JOHN DAVIS, of Council Hill Station, in the county of Jo Daviess and State of Illinois, have invented a new and Improved Sash Holder or Stop; and I do hereby declare thatthe followin gis afull, clear, and exact description ofthe same, reference being had to the accompanying drawings, making a part of this specification, in which- Figure l is a vertical section of a window frame and sash with my invention applied to.

it, x, Fig. 2, indicating the plane of section; Fig. 2, a vertical section of the same, taken in the line y y, Fig. 1.

Similar letters ot' reference indicate corresponding parts in the two figures.

This invention consists in applying to a Window-frame one or more cylinders, each of which has a spiral groove made in it to receive a roller attached to a sash, the cylinders having each a coil or barrel spring connected tothem, and all arranged in such a manner that the sashes may be raised or lowered with the greatest facility and retained at any desired point.

To enable those skilled in the art to fully understand and construct my invention, I will `proceed to describe it.

A represents a window-frame, and B a sash fitted thereon and arranged to slide freely up and down, as usual. To one side of the window-frame A there is secured in a vertical position a cylinder, O, said cylinder being equal in length to the height of the sash. The cylinder is provided with journals a at its ends, which are fitted in horizontal plates b, attached to a vertical plate, c, which abuts against the inner surface of one of the jambs d of the window-frame A. The horizontal plates l) and vertical plate c may all be cast in one piece, and the plate c has a vertical slot, e, made in it, extending nearly its whole length. The plate c may be held in position by angle-plates j'. A mortise or oblong opening, g, is made in the jamb d to partially receive the cylinder C, the plate c being at the inner side of said mortise or opening.

The cylinder C is allowed to turn freely, and it has a spiral groove, h, made in it extending its whole length. This slot has not a regular or constant pitch throughout its extreme length. The pitch gradually increases from the top to the bottom of the cylinder, the

object of which will be presently shown. The cylinder C may be of hard wood or of metal. If the former material be used, the lower edge of the spiral groove h has a metal plate, i, attached to it to serve as a way or guide for a roller, j, which is placed loosely on a horizontal arm, lr, secured to the top of the sash B, and projecting beyond one side of it. The arm k also has another roller, j', placed loosely on it, and working in the slot e of the plate c.

To the lower journal, a, of the cylinder O there is connected a coil or barrel spring, D, one end of said spring being connected to the journal a and the opposite end connected to the'plate c.

From the above description it will be seen that when the sash B is drawn down the cylinder C will be rotated in the direction indicated by the arrow l in Fig. l, and the coil or barrel spring E will be wound up, and the tension of this spring E will cause the plate Ii to bear against the pulley j with sufficient pressure to retain the sash B at any desired point within the scope of its movement, and

it will also be seen that when the sash B is raised the spring E will 'assist its upward movement, as the spiral groove h operates like a screw upon the pulleyj. The pressure of the groove h against the pulley j will be uniform throughout the entire length of movement of the sash, for as the sash B is raised the pulley j moves over a graduallydecreasing pitch of the groove, thereby conipensating for the gradually-decreasing power of-the spring E, and when the sash B is fully down, and the spring E completely wound up, the power of the latter will not be sufcient to raise the sash on account ofthe increased pitch of groove h.

My invention therefore serves as a sash stop or holder and as a sash-balance. One sash is only represented in the drawings, that being sufticient, as the cylinder for the other sash is arranged precisely in thesame way as the one described, the cylinder being at the opposite side of the windowframe and at its lower part.

I do not conne myself to the precise arrangement herein shown and described for securing the cylinders to the window-frame, for vlarious plans may be devised to effect that resu t.

Having thus described my invention, what ders, and all arranged to operate as and for I claimras nemend desire to secure by Letters the purpose herein set forthl p Patent, is

The cylinder C, one or more7 provided with JOHN DAVIS' a spiral groove h, in which pulleys j on arms Witnesses: k, attached to the sashes,work, in combination J. M. WEIR, with the springs E, connected with the eyln- S. MARSHALL. 

